With the pace of time, synthesis of nanomaterials has paved paths to blend two or more materials having different properties into hybrid nanoparticles. Therefore, it has become possible to combine two different functionalities in a single nanoparticle and their properties can be enhanced or modified by coupling of two different components. Core–shell technology has now represented a new trend in analytical sciences. Core–shell nanostructures are in demand due to their specific design and geometry. They have internal core of one component (metal or biomolecules) surrounded by a shell of another component. Core–shell nanoparticles have great importance due to their high thermal stability, high solubility and lower toxicity. In this review, recent progress in development of new and sophisticated core–shell nanostructures has been explored. The first section covers introduction throwing light on basics of core–shell nanoparticles. Following section classifies core–shell nanostructures into single core/shell, multicore/single shell, single core/multishell and multicore/multishell nanostructures. Next main section gives a brief description on types of core–shell nanomaterials followed by processes for the synthesis of core–shell nanostructures. Ultimately, the final section focuses on the application areas such as drug delivery, bioimaging, solar cell applications etc.

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中文翻译：

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核-壳纳米结构：最简单的两组分系统，具有增强的性能和多种应用

随着时间的流逝，纳米材料的合成已经铺平了将两种或多种具有不同特性的材料掺入杂化纳米颗粒的途径。因此，将两种不同的功能结合在单个纳米颗粒中变得可能，并且可以通过偶联两种不同的组分来增强或改变它们的性质。核壳技术现在代表了分析科学的新趋势。由于核壳纳米结构的特殊设计和几何形状，因此需求旺盛。它们具有一种成分（金属或生物分子）的内部核心，并被另一种成分的壳包围。核壳纳米颗粒由于其高的热稳定性，高的溶解度和较低的毒性而非常重要。在这篇综述中，已经探索了开发新的复杂核壳纳米结构的最新进展。第一部分介绍了介绍，介绍了核壳纳米粒子的基础知识。以下部分将核-壳纳米结构分为单核/壳，多核/单壳，单核/多壳和多核/多壳纳米结构。下一个主要部分简要介绍了核-壳纳米材料的类型，然后介绍了核-壳纳米结构的合成方法。最终，最后一部分将重点介绍应用领域，例如药物输送，生物成像，太阳能电池应用等。下一个主要部分简要介绍了核-壳纳米材料的类型，然后介绍了核-壳纳米结构的合成方法。最终，最后一部分将重点介绍应用领域，例如药物输送，生物成像，太阳能电池应用等。下一个主要部分简要介绍了核-壳纳米材料的类型，然后介绍了核-壳纳米结构的合成方法。最终，最后一部分将重点介绍应用领域，例如药物输送，生物成像，太阳能电池应用等。

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